Henry J. Koren om metafysikk

“Without metaphysics, the ultimate foundations of all other sciences are left insecure. In other sciences, we presuppose and take for granted such things as the principles of contradiction and of causality, the multiplication of individuals in the same species, the possibility of change, etc. If we accept all these things without examining their value, the whole structure built upon them stands on insecure grounds and thus leaves everything open to doubt. On the other hand, if we do not accept them, scientific knowledge of any kind will be impossible. Hence, in order to make true science possible, these principles and presuppositions must be examined, and their validity established.”